let str: string = '123'
let muban: string = `web ${str}`
console.log(muban)
let num1: number = 123
console.log(num1)

function greet(name: string) {
    console.log(name)
    return 'jjjj'

}

let res: string = greet('张三')
console.log(res)

let createdBoolean: Boolean = new Boolean(1)
console.log(createdBoolean)
let createdBoolean2: boolean = Boolean(1)
console.log(createdBoolean2)

// let u: void = undefined
// let n: void = null
// console.log(u,n)
let obj:any = {a:1,ccc:():number=>213}
console.log(obj.a)
console.log(obj.ccc())


// let obj2:unknown = {b:1,ccc:():number=>213}
// obj2.b
// obj2.ccc()